Detection method: semiconductor gas sensor Measurement range of alcohol concentration in breath: 0-200mg/100mL Exhalation time: 10s Measurement object: Alcohol concentration in breath Use range temperature: -5-45 Customs declaration temperature range: -20-50 Instructions for use (it is recommended to start the test 20 minutes after drinking, which is more accurate): 1. Press the power button, and the voice prompt "Please wait for preheating" will start the preheating and wait for 10 seconds 2. Voice prompt "Please blow" countdown within 10 seconds and blow for more than 3 seconds 3. Voice broadcast test results or view test results according to the light Function: Emergency escape without obstacles: built-in stainless steel cutter, seat belts can be quickly cut off in critical moments, easy to operate Three-color detection indicator light: red light for drunk driving, yellow light for drunk driving, green light for not exceeding the standard Colour:Black Material:ABS Tips: The product may be updated constantly ,Due To Different Batches, The Actual Product May Have Slight Differences Or Color Differences, Which Does Not Affect Use Package Contents: 1 * Breathalyzer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.